You will alas learn that not all XSLT engines are created equal. I've used Saxon, Xalan (both Java and C versions), MSXSLT and XML::LibXSLT, and found XPATH instructions that only one could or could not use. I've not used XML::XSLT for a while prefering the faster and I feel more feature complete XML::LibXSLT, but sometimes even this excellent parser dies, where Xalan was able to correctly transform the source.
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